* PALEOZOIC DELTA DEPOSITS 637 



to a delta-like prigin, represented to a certain degree by the modern 

 deposits at the mouth of the Mississippi. The abundance of spores 

 of rhizocarp-like plants, represented to-day by fresh water plants, 

 the presence of tree trunks, and especially the thinning away east- 

 ward and southward, and their interpolation between normal shal- 

 low water marine sediments, all point to the delta origin of these 

 shales. , 



Note: — For a full discussion of the Early Palceozoic delta deposits of Eastern 

 North America, see Grabau, 27. 



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